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fraga umbrosa, which are North Trish but not British, unless we regard 
the Saxifrage as a native of Yorkshire. 
The 29 species of the British type which are deficient are mostly 
lants which might easily be passed over as something else, and it is 
most likely, therefore, that a large proportion of them will be found 
ultimately. Such are Cardamine sylvatica, Callitriche platycarpa, Ve- 
ronica polita, Ulmus montana, Potamogeton oblongus, Agrostis, alba, 
Avena fatua, and Glyceria plicata. The absence from the north of Ire- 
land of 55 per cent. of the plants of the English type is a very nota- 
ble characteristic; in fact this is the circumstance to which, in com- 
paring the two lists, it is most needful our attention should be directed. 
Amongst the absentees are many plants which are both widely distri- 
buted and plentiful where they occur on this side of St. George's 
Channel. Such are Ranunculus arvensis, Ononis spinosa, Vicia tetra- 
sperma, Reseda lutea, Viola hirta, Senecio erucifolius, Galeopsis Lada- 
num, Anthemis arvensis, and Orchis Morio. The Cowslip and Chero- 
phyllum are both very local. There is but l`Zinaria, 1 Medicago, 
2 species of Allinm, 2 of Orobanche, 3 Campanulacee out of 14 
British species, in Dr. Dickie’s list. Out of the 6 Germanic species, 3 
are doubtfully Lao The other 3 are Monotropa, Orchis pyra- 
midalis, and Salicorn icans. The 34 Highland species seem mostly 
quite rare in this tract, dr all except 7 of them are plants which 
reach Yorkshire. The total North Irish flora is rather smaller than 
that of Surrey, which is about one-fourteenth of its area, and has only 
2 or 3 out of its 90 boreal species. North Yorkshire, one-fifth its area 
and under the same latitude, has of the three Australian types nearly 
7 species for every 4 which Dr. Dickie enumerates. 
Even in the county of Antrim cultivation ceases at about 1000 feet 
above the sea-level. The highest peaks may safely be considered as attain- 
ing Mr. Watson's Mid-Arctie zone. Salix herbacea, à good test-species 
for the lower boundary of this zone, grows upon several of the peaks, and 
‘descends to 1700 feet in Donegal. Erica Tetraliz and cinerea, which 
usually stop upwards in Scotland about where the Salix begins, attain, 
in the north of Ireland, 1600 and 1900 feet respectively. Dr. Dickie 
has made notes of the altitude attained by plants upon several of the 
higher peaks, but for further details we must now refer our readers to 
the book itself. 
